Please read the warning on that website “be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies.”

Those are not errors since HTML5 has never been formalized nor standardized, and that process should conclude by late 2014 . Even their regular validator is full of bugs (padding: 20 0 0 0; will always come up as an error even though its just as valid as padding: 20px 0px 0px 0px according to their own standard). That’s why Amazon, Ebay, Google and Yahoo fail with hundreds of errors on each page.

Thanks for the info. I could tell from the look of both elements that the code and its syntax couldn’t be changed, and as long as there are no <i>unavoidable</i> W3C errors I’m happy. Thanks again for your help.